planar illumination source

[leoyala]

Hello,

I am trying to use a planar illumination source, but got confused on how to input the extent of the plane. From the implementation described here: https://github.com/fangq/mcx/blob/master/src/mcx_const.h#L88 I see that it is defined in srcparam1, but I am not sure how to define both the position and extent of the plane with only 3 values.

Kind regards.

[fangq]

planar source has a quadrilateral-shaped launch aperture, with the 4 corners defined by

[srcpos, srcpos+srcparam1(1:3), srcpos+srcparam1(1:3)+srcparam2(1:3), srcpos+srcparam2(1:3)]

https://github.com/fangq/mcx/blob/v2024.2/mcxlab/mcxlab.m#L196-L197

so, if you specify srcpos=[10,12,0], srcparam1=[10,0,0] and srcparam2=[0,20,0], then the src area covers a square between x=[10,20] and y=[12,32].